Interfacial Dynamics of Dissolving Bubbly Turbulent Flow in Carbon Dioxide Sequestration Process

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With the two main objectives addressed in the present research project - (A) to clarify the relationship between bubble dynamics and gas-liquid mass transfer, and (B) to visualize the dispersive dynamics of dissolved component(s) the following achievements/findings have been made toward possible control of the interfacial mass transfer rate :(1) The dynamic process of gas dissolution from a CO_2-containing bubble into liquid, which represents an essential of the dissolving bubbly turbulent flow prevailing in the GLAD system, has been studied by continuously monitoring the bubble held in the liquid flowing downward. This visual study has been coupled with high-speed imaging for detailed observation of the bubble-surface motion.(2) Based on these visualization techniques established, it has been found that the fluctuating surface is viewed as a surface with propagating waves, and that the dissolution rate can be enhanced by such wavy fluctuations via the mechanism of reducing the surface … More renewal time.(3) A gas-dispersed system of controlled bubble size distribution has been devised to simulate the GLAD flow, in which a fiber-optic probes measurement technique also devised has been utilized to obtain statistic information on bubble dispersion under bubble-bubble interactions, toward mechanistic understanding of the coherently structured GLAD bubbly flow.(4) Another (transmitting) type of fiber-optic probe technique has been devised to measure the dissolved concentration around bubbles or droplets by applying laser-induced fluorescence with pH-sensitive agents.By combining the above high-speed imaging and probe techniques, it is now possible to investigate in depth the dispersive dynamics of the dissolved component from mutually interacting bubbles rising in turbulent liquid flow. This project has been an initiation (yet critical) step toward the coupling between these dynamics of interfacial flow and mass transfer, and has provided very important findings toward better control as well as under standing of such complex phenomena. Less